All plankton are microscopic (too small to see without a microscope).
algae
prokaryotes
the ocean
zooplankton
To attract a mate
To scare away predators
To see in the dark
Just for fun
Millions of cells
Thousands of cells
A few dozen cells
Hundreds of cells
aquatic (water-living)
microscopic
plants
drifting or wandering
phytoplankton
eukaryotes
it kills large predators like sharks.
it makes the water more acidic.
it makes the water saltier.
Zooplankton are tiny animals.